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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba5033028e3bfae05a88e92ef7fa55ea90bb1b396a26eddb504c82b83c51aa8d' 
  AND token = 'XWwYNPuVOFP8l0s6D4Ef5BYaKYkUc0Yn1YMxh1jKIwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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