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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f84898966aa4daf12a78cda6c83ee6e8b685c7ddbfda6fa06a5e7dede3e1b35f' 
  AND token = 'YsW/AHJAYxmlSIdgFqqehrp73IV9TYAs303sNJNRue0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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