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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4156c2cad8d4ea75dca3ed2cc84e6705a418077c869b6785b0a8bc68b2f391c' 
  AND token = '/EN44axZ70MJVE3hF8/7ZNM7w5ZkPNaWTUBq1b/Rz8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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