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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adc26fcca8f9b7840961d378e861d0f46e416352352c17593c8ffbfc452ce401' 
  AND token = '9I6g6CHzO6+J6xXf7ZJVQzeuw6bLmHIWGU4VSf8T98g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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