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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a81bdf04f3544ebca872d60befb1d9f6c071b87ee3072a5ad729af17e5ccee7' 
  AND token = '7hv0/CqL6hcnUQ0EW3AU8FLFmdfesLl2uW9LCCR5Jac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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