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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f76bdddc14159913d09e6cb20cec285ddf301c6c90622110403ff79b7e19b89' 
  AND token = 'yn+CSCRfqVcF+L6af02KM2gPhuXzuVaDJt2lpzCD7Ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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