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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '277c443f0753b4390a5638482daf8c6a254a920f39e423ecae1d1c0c1e5e3bba' 
  AND token = '8Ypl4jspoXtpYHjMj2DdYBcvzGaocAEsnK20HGyy/nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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