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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7958cb8d11b757f74cf220fa5697395dbf95a853b804bd232c1d7b3409835498' 
  AND token = '7C3l7S8jHKhGAXwfL1nOIeJHn8q6l1dMz5ZpLnMdyr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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