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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12fff11feaa83f02596128086f1e988c9d7498c378a75a5bf4158240af19cc2b' 
  AND token = 'l6fwJU8gScdXX8fyxMmSO6kfs+bBf75ZYSosM3ZI+Jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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