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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0213ba9137708d23106c05543d38b810f37e2966ab06470fc76377c56d6e7b0' 
  AND token = 'MTJJEJv8yfar8BJ7/3WaLiO46Cq4OepBwXeXaSu6gzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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