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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67c51ce1b52a97a466098068c0b44625a97173febfe8b77600b8c6c1c39005f2' 
  AND token = 'WUF7Sg4bx2bnPAfm5VBX7O8wuJPy1KT9kA1bkSihBbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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