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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '506c166f69f6069f33fdd7baf75bfc1df380401b07c72f6fda88c5b94e9df7c8' 
  AND token = 'hgIvtVMndedwPU/Eks6CwazfNxu8hndOZSKyzIm1UMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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