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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f92cc5fe2ee7154347c9f2d6f8c297fa2ca128a5792e9d996d93ca274f3fc536' 
  AND token = '39/Q79neD6PXIgKTmajZLJfzhbn8C4ahlEskTDFdEqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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