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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5af37ee79af772908267d1889d23ed5e81d3b66eea238e73ea8774fbe0f204f' 
  AND token = 'QZyvdIACNArsQ3ATt90wDuv2Ep+HuV9sF0d+Cs1Pqw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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