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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '138a2ae4ea8d207271b0e3363257eb4e3efcdf73efa16ccfaa91903f9358e452' 
  AND token = 'h41KGXSmxAAklkdmoAQShJLFC7D6CwmQWLCULCrKZwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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