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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb48f2c7c06b3061cedc7a7f211c8ec5f669ed53d1c998f1a1f7597cb61a92c1' 
  AND token = 'tKfq7E/xOhfAPX4YGbp6thXYYD1qpm+L48pws630Nms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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