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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '061c91eeb11ff1c7a3a32a6d7f4444d726093e191a85a27d40ec7dd9441d4912' 
  AND token = 'BDoatT+kHmBB/CkWH39Kzv3i+lVt/Ro//L3nx/9W8gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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