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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c34d31ecbe5a78ad1a6cf41c050fe9ad800ba3710876f0231cb6015f3204c47a' 
  AND token = 'ZelWa5PUL3qKWKA4YX1cYZCgRfwqhC7HnueKDuPuKtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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