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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b8c96ae13660edfb7929e6a93e7a0d2c11f82ad64e2692a176637232dbdae5e' 
  AND token = 'MHkQSvKlknv5crQXCcSKVq8r62/HqsjTlQCkrBxWjLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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