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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f14acbf4fba31f9f64d944e6e9a6893abd6c9dcab72ffad61dcd45804ed9307' 
  AND token = 'V7rUtU4KYbNuf4fw21CS4ySV/LgDu2EeAHoe10sf09Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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