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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5c45f8a3a41e59ab829f6904ff3828f253c983dcdbcf293f9092ec5090f43d1' 
  AND token = '7dkvGEXnCyKdmQ8t53mJ1b8LI0QnH5MHzMV9v8zrFYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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