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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d6a9a18f314f52cc22e3329f111683fa2a5bec82a8e3feb59bc8923ab124ead' 
  AND token = 'EZn7qgTTJvTEGJtF7XrYY5mjgh1qhc11wX5oQyOMsms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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