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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53cde4e933537942d422c5d6a6f7d93a879fff6ff8eadbc814d7846606c05b0d' 
  AND token = 'KpXMKm7AL23VoBeXQrW36EOoD/Vfw5e7UBGDqSmrcg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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