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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76a4afdeb53fd54f238cb774f29a9e45c50431b64d618a0ce2e0e14895a5cb80' 
  AND token = '7SAEv8rwTTvv7Hz73ujltxPIHo9BRE8KM0L4ng/8LE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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