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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '532db2d9008c2a3d5c5a0b9d3ed982e4f125caffda5f0f63a706ff6346ec4e77' 
  AND token = 'mRG9X+MX/gLQ1nLXvvwZZH9t0FkgRWOnNky+64iv39o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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