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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf5e7e34a1b9dcdcb3d80c986c88ca2837cb6c21fdc7709a82fb361876722b56' 
  AND token = 'Cq7qY82WcPZCr8tQI77p7bu9wwvG9bDKDfD2lL6EdHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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