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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7884fa5e9ab305e321a96ec91e09450ee7b14bde8c7c8e032f2384ad3078939d' 
  AND token = 'b9FjPKtJSyJp16WPnq/nO69YONDLMQs7bD50xoPjbpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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