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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92e6f09832230235fbc290622fa819f052a2707e1655d0f0d5e225147ce5dfd7' 
  AND token = 'U+LF6p3a/+SkSw5cdv2s7ib60qOkEHg1mpb0IdBmK5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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