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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07bd293a0c3d90ebff4960107a86e384e7df87fba074ef6c3b17b1eb71542803' 
  AND token = 'NrZvJD0Ks4Xie7nO7reogaNwUgkrZOpC0I8lrmKmHAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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