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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '875db6d545cb152e665ba9b928868858ff7a043bc129436f2738dcda347a5702' 
  AND token = '0maZlUfsDnbqc7mE143mcIvvDIxP2VWncjE42VGPs0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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