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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8969ce36a41f900b09b035dde9ea976bc532a5ca3e078e01d7e35f1e356f81ed' 
  AND token = 'eLhrqjEZn6YECaXkbWeInGRDve5ERTKeK3npeoJJNqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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