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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b3e990da4eabf930475c1300f6ea932ed07f2f7e3fb126980d3aa6e21bf643c' 
  AND token = '8aJfd3CJrahJsbCGgfTi1CMTJq5j7cI3WkVmwJb5VuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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