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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1953cfb6204134ae5a2877fbac8bc166e20f80490471f41b276a4b117803f18f' 
  AND token = '7J62F/K6e8nGcdydNXP5BOMh95GIFTmCWjJG57U3tZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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