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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f66c32afa965e4ab8dd5847939a5daccbd2600f77817a780c1e86095ebedf31' 
  AND token = 'fcLu583A8AEXcKB7XsPw3yeqjD2xtf3bZ2L5a/bA+BE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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