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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7ce539d22189a676e4d985ae2c7674d42def7016daf01dd4cbc32cb0cea0030' 
  AND token = 'He/0EHE12oyQYfIk7TuHVORmQGHywouCf7hmC0cQqz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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