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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bed5f3bef72abe2416f2691bcca8fc3bf34cbe01e7165f29c83a4cc129acb0b3' 
  AND token = 'T45SBZ2pgaf+UA3Cb75ouu8p3mz7U4n5g0MrCDhFmCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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