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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44cc4f39249eb3d4f453cc69597dd4b52f5c82c30a488d55dc96c7ef4505ea72' 
  AND token = 'zWhjoBSoHFNiYc761iTOx+T96pSVnCP7bIsZ5sncP+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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