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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fa3ba03e8ed85d2a63928c8203be9b03f98960bb51ef3f7cb6e24e61792dbb9' 
  AND token = '7OG7XlJpoPj5N8GR3p4l63Yz8SeO3kQy8/OcuYV5xdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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