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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09ef93eb4eb86e594ad37a1ee38d77bba00864fa22db7575208eefdba8a91ab3' 
  AND token = 'rn1MN/0KUSLEMhyRzeoYNjNVoB7k58cNgDHmaag+k+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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