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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'badec3dc063d807afb306e7c5364ff4da45efa82cd5197ffc69543425c71cf7b' 
  AND token = 'seNhPDTTdi49aiHGKQWtzYiZ0mHrF2cc5z+LlUk7f90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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