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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bb0b5a2b4368dbe37c66af6451e327522c15a0d94dc126f595df1f8aa1b88e0' 
  AND token = 'T7t5tIlDd+mxAxfEjplbLmlWIkKfKqXyu2epr8d4Xyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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