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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e9f0e20e8d5b545aa803ac7f2356d64296dcf3716c27b83fb887e751d6b0c2c' 
  AND token = 'j1AviK0bkPGrClM1gMSZjKvuHoT2/nqZsKur55iOvoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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