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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7ea39ba9931c57fff126bdf2bb7b5c1b4b118b758a9db457ccb4ec2fb0cda71' 
  AND token = 'CIX+TIuGFGt65+ouNz5rK3thZh7vc19h6ld5fAecIME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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