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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7cf91f50d9c8194865bc9da9ba0aa1e80f3f2f3f4b1827a7d14b429640e1f23' 
  AND token = 'esCZagchUFYURbdQ48TU9FWbuhbME4dBxTy+cV9qoQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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