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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18abc8c9948ebab25e6e0e58839f002aa5e585c79c1cf3405be765e97d7a0d7a' 
  AND token = 'Iu7LLH8mBGReG3f0tMKu5dM34baoRRLYRclcHW/KDTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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