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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c368a5c9b47f9b7b8f07cbb98336d5ab5483d1c1be5997f35c5ff721d3eb4fb' 
  AND token = 'OfmxF8u7O9anQbsaP1cAng1OVziTiKO28YBIV2FHO/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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