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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed465df9ef6fdcf0b84e875153bec75e234500b0e3b1ddfe84e32ef0c2b71d27' 
  AND token = 'cOSLZBG+XEP2dgX4ipxU9C9COaP6B3fznQznEYYNVJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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