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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbfdf9b98b4197c279ec0287037346a733c16f2dd5bc787d905ca7131b9611ac' 
  AND token = '70Uo9Zd5zhOpA6kK1VBKsrXOAOSdYiS0lt8MgsW8Rfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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