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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '344939ae01e83f1ea61443b49ae3b5a6a1fc092413eab40c06f664a9a3a2d440' 
  AND token = 'nXbyR8rr+nrEZfN2ZizeSqNBPutqVFO7u8zilwtlUng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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