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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f1cf0ec95f8edbedf2ee5f68ae7e0fbfe6d5a1f2271cc3392329b0920abca94' 
  AND token = 'ld/GDlutVxlPkVBMnvmvMe1KkWnsNvc6SgWGspFYaBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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