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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab60bad59290751afd633ddb272a610281de08bccd51941bc4c94c82b5e37dc3' 
  AND token = '+kKdxatBCbuk300KJKKkcJgYWt5FQj9yL9Nk+iX09h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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