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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eed8e7f856367a4e2f1453e29ee8c320d4c02c2579dd1114440158317debdc9' 
  AND token = 'cRyZ9H7ktLYNEOyLhtCn9w7zf94fY6JbH2o0XRjrrUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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