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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b62c81a75f48e55509e4fb78cabbebe6d68d7a666fa73afafa78643aa06f314' 
  AND token = '2zyqaTr/l40vMgje73FiC2VfBAN55cMF9tQpqlCTj1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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