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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bf05d9b2d0f7403499d87a11db2d7c5a520eaa1ac1ed13a6b0da8a815c67269' 
  AND token = 'ak5B+A0IYZNiwzW6kUfCJrlgoloP/0juy3wdk/Cb0Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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