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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8be5ed602cdbef82c2d875aa93c0e526b15ca36814f83079a1c151976213be7' 
  AND token = 'w/93Ke+ZXSi5u4uXXPV1DcipkxCgnMClcynvLCS0Bew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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