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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '897bde606187a49ee3fe6c65b35c957f5e8b35afe1dc70b6e0bb5edfb3076a1b' 
  AND token = 'Suf6YXywhCqkFJeDcYKEZ0OHiMHxZWPkkUMTA3IU/P0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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