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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb2c0bc9770582e2fd48d7ec1250b3a7c54fc259dddbe802e3517eedb75b7f3c' 
  AND token = 'Zfu8lYh2clSr4IEJln3QiPY+4KajCMBQ+7LWmeI0HLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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