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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eff3f4285bcccc172438aad889206c3e7e88b9bc3144fe8c3d59dd1563ef4f5' 
  AND token = 'Y9ZLfUc+cOOP6+isTAysFzJK3rn8ZUJb7/465wrv+Rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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