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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea05c20d16dccfdfea465429ee6fc583bd5f936a3634894a254da7529a42d10e' 
  AND token = 'OFcEJrn020lbZShr7ejAEEjmLCg5Plizi7q9ypIxLYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}