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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38c03d645a3a9277fad24e30549f555f7169466092601c0142bd4a5aef9aed7f' 
  AND token = '3igaa0kNEypRNnNhoO6+s1AopHdQA3f0b5588thoGgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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