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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb31c7e9667d4d9ee0ec460d8b66db05f425e22c721dcdf379842e7a40f6e84b' 
  AND token = 'dhAYwzqDVOE3NhM/A27YI0NHL85GNHMtvY4cfJBEBq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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